Final answer:
An ensemble of similar cells that carries out a specific function is known as a tissue, which is the foundation of organs and organ systems in multicellular organisms.
Step-by-step explanation:
An ensemble of similar cells from the same origin that together carry out a specific function is known as a tissue. Tissues are the building blocks of organs, which consist of different tissue types working together to perform a common function. In turn, several organs combine to form an organ system, and multiple organ systems work in unison to create an organism, such as a human being. Cells forming tissues represent a fundamental aspect of biology, reflecting a higher complexity in the structure and function of multicellular organisms.